.mention-input-container{position:relative;width:100%;min-width:250px}.content-editable-input{padding:8px;font-size:16px;border:1px solid #ccc;border-radius:8px;outline:none;line-height:1.4;word-wrap:break-word;white-space:pre-wrap;text-align:left}.content-editable-input:empty:before{content:attr(data-placeholder);color:#999;pointer-events:none}.mention-chip{display:inline-block;background:#007bff;color:white;padding:0 4px;border-radius:4px}.mention-modal{position:absolute;background:#fff;border:1px solid #ccc;text-align:left;border-radius:8px;overflow:hidden;width:250px;box-shadow:0 2px 8px rgba(0,0,0,.1)}.mention-no-options{padding:8px}.mention-option{padding:8px;cursor:pointer}.mention-option-highlighted{background:#f0f0f0}